The eagle stamp - preliminary proof of the unfinished barrel, before 1939
crown over U - definite proof of finished gun
crown over W - proof for choked barrels
The top pictures seems to show a date stamp of 1 38, next to a crown over S for smoothbore barrels.
I don't see the Suhl mark
, it would be a crest with a pick in a sole.
The best source I've found for proof mark info is Wirnsberger's
book, but there is a lot of conflicting info out there.